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我有一个应用程序，它有一个身份验证屏幕作为它的第一个视图。如果身份验证成功，则加载一个 tabbarcontroller。标签栏中的所有视图都要求用户输入密码。我需要做的是，当用户输入错误密码 5 次时，会弹出一个警报视图，并且应用程序会返回到身份验证屏幕。我能够从超级视图中删除 tabbarcontroller.view。但在那之后屏幕是空白的。不显示验证屏幕。我能做些什么来完成我的任务？

编辑：

- (void) alertView:(UIAlertView *) actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (actionSheet == alertDeActivate) {
        if (buttonIndex == 0) {
            NSLog(@"Alert Deactivated");
            UIWindow *window = [[UIApplication sharedApplication] keyWindow];
            if (!window) {
                window = [[UIApplication sharedApplication].windows objectAtIndex:0];
            }
            [self.tabBarController.view performSelectorOnMainThread:@selector(removeFromSuperview) withObject:self waitUntilDone:YES];
            [self.dataLayer notifySplashRemoved];
        }
    }
}

-(void)notifySplashRemoved
{    
    bool userAuthenticated = [self checkForUserAuthentication];
    bool appAcivated = [self checkForAppActivation];
    if (userAuthenticated)
    {
        if(appAcivated == false){
            self.activationScreen = [[ActivationScreen alloc] init];
            [self.activationScreen setdataLayer:self];
            [self.window addSubview:self.activationScreen.view];
        }
        else
        {

            _tbc = [[UITabBarController alloc] init];
            manageVRNs = [[ManageVehiclesView alloc] init];
            aboutUsView = [[AboutUsView alloc] init];
            helpView = [[HelpView alloc] init];
            optionsView = [[OptionsView alloc] init];

            _manage = [[UINavigationController alloc] initWithRootViewController:manageVRNs];
            [_manage.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigation_bar.png"] forBarMetrics:UIBarMetricsDefault];
            _about = [[UINavigationController alloc] initWithRootViewController:aboutUsView];
            [_about setNavigationBarHidden:YES];
            _help = [[UINavigationController alloc] initWithRootViewController:helpView];
            [_help.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigation_bar.png"] forBarMetrics:UIBarMetricsDefault];


            self.navCon = [[UINavigationController alloc] initWithRootViewController:optionsView];
            [self setnavigationCon:self.navCon];
            [optionsView setdataLayer:self];
            if ([navCon.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)] ) {
                UIImage *image = [UIImage imageNamed:@"navigation_bar.png"];
                [self.navCon.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
                [optionsView addSelfView:window];
            }

            _tbc.viewControllers = [NSArray arrayWithObjects:navCon, _manage, _about, _help, nil];
            [_tbc.tabBar setBackgroundImage:[UIImage imageNamed:@"menu_bg.png"]];
            [_tbc.tabBar setSelectionIndicatorImage:[UIImage imageNamed:@"menu_selected.png"]];
            [window addSubview:_tbc.view];

        }
    }
    else
    {
        self.authenticationScreen = [[AuthenticationScreen alloc] init];
        [self.authenticationScreen setdataLayer:self];
        [self.window addSubview:self.authenticationScreen.view];
    }
}
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1 回答 1

0

代码看起来不错。
屏幕很可能是空白的，因为没有添加任何视图。如果您的window变量为 nil，或者您正在nil传递addSubView:.

我的建议是您放置一个断点notifySplashRemoved并检查window（或self.window）和您传递给的视图是否addSubView:有效（不是nil）。

于 2013-11-08T09:31:40.040 回答